It is unclear why the Haitian Police got themselves involve...

It is unclear why the Haitian Police got themselves involve into arresting a photo- jounalist taking a few historic pictures of Ms Oprah Winfrey's visit to Haiti.

This is not the role of the police, unless there is some sort of harassment to the person.Her body guard would have dealt with that.
Ms Winfrey is a public figure, a celebrity accustomed to have her photograph taken; therefore, acceptable.